Corey, Pie times the radius squared. So your 3-inch round port should be seven square inches (1" X 7" or 2" X 3 1/2", etc.) The port length and surface area determine the resistance which combines with the box internal compliance and woofer parameters to arrive at a tuned frequency. As long as you don't alter these ratios, the shape of the port will have little impact. David Earmark Marine
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